user
Change the third sentence in the text to make the meaning more clear.

Additional Context:
Electric cars have been hailed as an important solution to reduce the environmental impact of transportation. The cars, however, require their batteries to be charged,  and impact the local energy grid.

Answer:
assistant
Electric cars have been hailed as an important solution to reduce the environmental impact of transportation. The cars, however, require their batteries to be charged, which can have a negative impact on the local energy grid.